A police whistleblower has come forward claiming to have evidence showing how
his colleagues “stitched-up” former chief whip, Andrew Mitchell, in the
so-called Plebgate row.

The officer, who is thought to be a superintendent in the Metropolitan Police, has alleged that there was a conspiracy aimed at destroying Mr Mitchell’s career after the MP swore at members of Scotland Yard’s Diplomatic Protection Group.

The officer is understood to have told lawyers that damning evidence contained in a police log was “doctored” by police, angry at what they perceived to be Mr Mitchell’s arrogant attitude.

The MP for Sutton Coldfield, was forced to resign from his Government post after it was alleged that he had called officers in Downing Street plebs when they asked him to dismount from his bicycle.

Mr Mitchell admitted swearing in frustration at the officers on duty but vehemently denied using the toxic phrase “plebs”.

Scotland Yard launched an investigation into his claims after questions were raised about the police officers’ version of events.

So far eight people including five Metropolitan Police officers have been arrested and a file of evidence is now with the Crown Prosecution Service (CPS) awaiting a decision on whether any charges should be brought.

But now a whistleblower has alleged that a senior officer passed him information showing how police launched a carefully orchestrated effort to destroy Mr Mitchell’s reputation.

The officer, who has not been named, has admitted he was not present at the time of the incident on September 19 last year, but his evidence is being taken seriously by those looking into the matter.

The whistleblower is understood to have given a statement in which he claims: "On the 18th September, 2012 Mr Mitchell had also insisted on being let out through the main gate. Following this [officer X] said to the other officers: 'Right, we can stitch him up'."

He then claims the word “plebs” was added to the original police log, before details were leaked to the media.

A spokesman for the Metropolitan Police said: "This has been a lengthy and complex investigation involving the supervision of the Independent Police Complaints Commission.

"Many lines of inquiry have been investigated and the final file is now with the Crown Prosecution Service who are considering all the evidence."

The Director of Public Prosecutions Keir Starmer said the police file had been received by the Crown Prosecution Service on Friday.

Speaking yesterday he said: “We will come to a decision as quickly as we can, given the nature of the exercise. We have got what we want, we are hard at it and we will come to a decision as swiftly we can.”